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Incentive Plan - Summary of stock option activity (Details) - Equity Incentive Plans
$ / shares in Units, $ in Thousands
 3 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Shares:  
Outstanding, Beginning of Period | shares 529,000
Granted | shares 0
Exercised | shares (15,000)
Forfeited | shares 0
Outstanding, End of Period | shares 514,000
Vested and expected to vest at year end | shares 510,800
Exercisable at year end | shares 498,000
Weighted-Average Exercise Price (in dollars per share):  
Outstanding, Beginning of Period | $ / shares $ 12.77
Granted | $ / shares 0
Exercised | $ / shares 10.21
Forfeited | $ / shares 0
Outstanding, End of Period | $ / shares 12.84
Vested and expected to vest at year end | $ / shares 12.80
Exercisable at year end | $ / shares $ 12.63
Weighted- Average Remaining Contractual Term (Years):  
Outstanding at year end 5 years 22 days
Vested and expected to vest at year end 5 years 15 days
Exercisable at year end 4 years 11 months 16 days
Aggregate Intrinsic Value ($000):  
Outstanding at year end | $ $ 2,838
Vested and expected to vest at year end | $ 2,838
Exercisable at year end | $ $ 2,838